Need help with the exercises

I. (Solve the following exercises using the substitution method). 1) 5x-2y=22 2)10x+5y=15 X+2y=2 2x-3y=-9 l|. Solve the following exercises using the elimination method). 1) 5x-y=3 2}-3x+3y=12 -2x+4y=-12 x+4y=6 I. {Solve the following matrix exercises}. 3 51 4 = 1 -15 2-13 2 'l -1 2-1 6 01 2 4 3-2 230 213+102 = 23 +12 - 35: 1 5 2 2 5 1 1 0 2 3 1 6 II. {In a group of 50 workers, the average wage is $75 per day per worker. If some of the workers eam $70 a day and everyone else earns $80 a day, how many workers male $70 a day?) II]. (An airplane has 24 seats in class A and 62 seats in class B whole sale represents a total of $15,390. However, only 10 seats in class A and 40 in class B have been sold, for a total of $8,750. What is the price of a seat in each class?) IV. A seller of miscellaneous items sells 100 toys, 50 makeup and 50 perfumes the rst fortnight. 111e second fortnight 60 toys, 60 make-up and 100 perfumes. The unit prices of each of the products are respectively $2.50, $3.000 and $10.00. V. provide a matrix of size 2x 3 that represents the number of products sold in the two fortnights}. V]. {provide a column vector that represents the price per unit of each product). VII. Find the column vector whose elements show the income obtained from sales the first and second fortnight